Water vapour transfer in waterproof breathable fabrics Part 2: under windy conditions

Water vapour transfer in waterproof breathable fabrics Part 2: under windy conditions To assess the effect of wind speed in practice, experiments were conducted under conditions of realistic wind velocities generated in the climatic chamber. The theoretical and experimental results were compared. In the theoretical model of forced convection between the human skin and the external environment the water vapour transfer rate was found to be proportional to V 0.81 . The experimental results obtained when a layer of fabric was included showed that water vapour transfer is proportional to V 0.5 . The rates of water vapour transfer for the fabrics ranked slightly differently from that seen under steady state conditions; microfibre fabrics, cotton ventiles, PTFE‐laminated fabrics, hydrophilic‐laminated fabrics, and poromeric polyurethane‐laminated fabrics. Condensation was reduced under windy conditions. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png International Journal of Clothing Science and Technology Emerald Publishing

Water vapour transfer in waterproof breathable fabrics Part 2: under windy conditions

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Publisher
Emerald Publishing
Copyright
Copyright © 1997 MCB UP Ltd. All rights reserved.
ISSN
0955-6222
DOI
10.1108/09556229710157858
Publisher site
See Article on Publisher Site

Abstract

To assess the effect of wind speed in practice, experiments were conducted under conditions of realistic wind velocities generated in the climatic chamber. The theoretical and experimental results were compared. In the theoretical model of forced convection between the human skin and the external environment the water vapour transfer rate was found to be proportional to V 0.81 . The experimental results obtained when a layer of fabric was included showed that water vapour transfer is proportional to V 0.5 . The rates of water vapour transfer for the fabrics ranked slightly differently from that seen under steady state conditions; microfibre fabrics, cotton ventiles, PTFE‐laminated fabrics, hydrophilic‐laminated fabrics, and poromeric polyurethane‐laminated fabrics. Condensation was reduced under windy conditions.

Journal

International Journal of Clothing Science and TechnologyEmerald Publishing

Published: Mar 1, 1997

Keywords: Clothing industry; Fabric; Tests; Wind power

References

  • Principles of Environmental Physics
    Monteith, J.L.
  • The physics of the microclimate
    Clark J.A., Owen; J.M.; Turner, A.B.

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